PAGE 



aborigines 382 



acids, humous 95, 96, 348 



Acilius 333 



Acorus 157 



Acroperus harpae 300, 301 



adaptations 260, 274, 277 



Adineta 299 



adjustment 248, 261 



adjustments, individual 242 



" mutual 242, 282 



adjustability to waves 319 



aeration 73 



Agassiz, Louis 19 



Agraylea 216 



agriculture 379, 402 



agricultural crops 404 



air-breathing 231 



air-chambers 275, 277 



air-spaces 265, 271 



air-tubes 279 



albumins 48 



alder 158,351,352 



ale-wives 232, 373 



algae, 26, 28, 29, 45, 46, 72, 

 100, loi, 102, no, 119, 137, 

 144- 145. 151, 169, 180, 181, 

 183, 189, 217, 220, 223, 295, 

 296, 301, 302, 304, 307, 311, 

 322, 391, 345, 356, 362, 373, 

 390, 395 



, "blanket" 336,345,399 



blue-green 



109, 132, 297, 302, 326 

 filamentous blue-green 296, 310 



brown 135, 136 



fresh water 101 



free-swimming 28, 339 



gelatinous lOi 



green 124, 129, 299, 302 



filamentous green 124 



plancton 50, 244, 392 



protococcoid green 318 



lime-secreting 50 



marine I35 



of ponds 335 



red 135, 136 



sessile 120, 126, 336 



PAGE 



algae, siphon 121 



" slime-coat 331^ 



" tufted 112, 126 



" unicellular 112, 126 



Allen, Arthur A 95, 342 



Alismaceae 156 



Alisma 



334 



alligators 238 



Ambystoma tigrinum 237, .342 



ammonia 25, 48, 49, 140 



Amoeba 159 



amphibians. . . 148, 231, 236, 237, 337 



Amphipoda 189, 191, 341 



Amphizoidae 224 



Anabaena 132, 133, 295, 296, 297, 

 305, 308, 392 



Anacharis 155 



Anapus 299 ^ 



Anax 155,341,389 I 



" Junius 196 



Ancylus 182, 260, 370, 373 



Andromeda 157, 350 



angling 407 



animalcules . . 295 



animal forage 387, 399 



animal husbandry 384, 400, 408 



animals, hoofed 312 C 



animals, limpet-shaped 260 



animal Hfe of marshes 345 



animal population 324 



animals, warm-blooded 273 



Ankistrodesmus f alcatus 129 



" setigerus. . . 129, 131 



Anodonta 180, 288, 290 



" edentula 324 



" grandis 324 



" imbecillus 288 



antennae 185, 189, 247, 251, 312 



Anthomyid fly 359 



Anthophysa 162 



Anthony, Maude H 214, 215 



Anuraea 299, 300, 303 



Aphanizomenon 297, 304, 392 



apical buds 154, 138 



Appalachian hills 60 



applied science 21 



Apsilus 299 



421 



